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After the publication of this work [1], we became aware of the fact that we inadvertently failed to include the work of Chen et al. [2] when listing previous studies that use PPIs to prioritize disease candidate genes. In a pioneering study [2], Chen et al. used a initial gene list for Alzheimer's from the OMIM database, expanded it based on protein interactions, and proposed a scoring function to identify other Alzheimer's disease causal genes based on graph-connectedness.